Re: [Full-disclosure] OpenID/Debian PRNG/DNS Cache poisoning advisory

["Dan Guido" <dguido@xxxxxxxxx>]

*cough* http://codefromthe70s.org/sslblacklist.asp *cough*

--
Dan Guido



On Fri, Aug 8, 2008 at 12:57 PM, Eric Rescorla <ekr@xxxxxxxxxxxxxxxxxxxx> wrote:
> At Fri, 8 Aug 2008 17:31:15 +0100,
> Dave Korn wrote:
>>
>> Eric Rescorla wrote on 08 August 2008 16:06:
>>
>> > At Fri, 8 Aug 2008 11:50:59 +0100,
>> > Ben Laurie wrote:
>> >> However, since the CRLs will almost certainly not be checked, this
>> >> means the site will still be vulnerable to attack for the lifetime of
>> >> the certificate (and perhaps beyond, depending on user
>> >> behaviour). Note that shutting down the site DOES NOT prevent the attack.
>> >>
>> >> Therefore mitigation falls to other parties.
>> >>
>> >> 1. Browsers must check CRLs by default.
>> >
>> > Isn't this a good argument for blacklisting the keys on the client
>> > side?
>>
>>   Isn't that exactly what "Browsers must check CRLs" means in this context
>> anyway?  What alternative client-side blacklisting mechanism do you suggest?
>
> It's easy to compute all the public keys that will be generated
> by the broken PRNG. The clients could embed that list and refuse
> to accept any certificate containing one of them. So, this
> is distinct from CRLs in that it doesn't require knowing
> which servers have which cert...
>
> -Ekr
>
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> Hosted and sponsored by Secunia - http://secunia.com/
>

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/